Improvement in paint-mills



G. P. ZlNDG RAF.

Faint Mill Patenied Jun12, 1866.

WIT/YE UNITED STATES PATENT OFFICE.

GEORGE PHILIP ZINDGRAF, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN PAINT-MILLS.

Specification forming part of Letters Patent No. 55,572, dated June 12, 1866.

To all whom it may concern:

Be it known that I, GEORGE PHILIP ZIND- GRAF,ofPhiladelphia, in thecounty of Philadelphia and State of Pennsylvania, have invented an Improved Mill for Grinding Paint, 85c. and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to balancing the runher-stone of a mill for grinding paint, 860., and to the peculiar arrangement of a feed-screw.

To enable skilled mechanics to make and use my invention, I will proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figure l is a sectioned elevation through the lines A B A O, and Fig. 2 is a top view.

Similar letters refer to similar parts in the several parts.

A A A are the uprights or frames of the mill, which are connected together at the top by the plate or entablature B, and at the bottom by the radial stays O O, 850. D is a stationary millstone, carried by the bolts a. a, &c., passing through and supported by the entablature. E is a regulating-hopper, the cylindrical part or waist I of which is received into and fits snugly the eye of the stationary stone.

G is a lever vibrating on the pin 7). One end of it is slotted to embrace the adjusting-screw H, which screws through the plate I or a projection of the entablature. The other end is forked to embrace the waist F of the hopper, it having bolts 0 c oppositely on its surface, which are received in openings in the prongs of the fork. As thescrew His screwed down or up the hopper is raised or lowered.

K is an adjusting-lever vibrating on the pin 0, attached to the center piece f, of the radial stays. L is a lighter rod screwed into a vibrating nut, g, at the end of the lever. It is furnished with a wheel or handle, M, so that on turning the rod by the same the lever is elevated or depressed. h is a step supported on the tip or point i of the lever K. It fits snugly in a loose gland, It, in the center f. It is centered by'set-screws in the same. The mill-spindle N is received into the step, turning on a friction-button, i. It is centered by the loose gland k and by the set-screws m m, &c., which pass through the hub n of the holder 0, and are inserted into the boxes 0 0, 820., which encircle the spindle.

P is a runner-millstone. Q is arynd, firmly and securely fitted in the eye ofthe same. The mill-spindle N passes through the top of the rynd into the hopper, to cause it to balance and carry the runner-stone. I make thatlengthp of it which projects through the rynd of less diameter than the length q and round the shoulder 1' thus formed, (shown in dotted red lines, Fig. 1,) to fitin acorresponding rounded recess or cup in the top of therynd.

To facilitate distributing the paint or other material to be ground, aconical-shapcd cap, R, is attached to the part 19 of the spindle resting on the rynd or the stationary stone. A feed-screw, S, of size to correspond with the waist of the hopper, is also fixed to the spindle. s s aredrivers attached to the spindle. They take against the wings or radial projections t t of the rind. T is a shield surrounding the stones, which prevents the ground material from wasting.

Motion is communicated to the spindle by a belt and pulley, or other known mechanical device, which it transmits to the runner-stone P through the medium of the drive-rsss, the cap It, and the feed-screw S revolving with the spindle. The paint or other material being thrown into the hopper, the feed-screw S carries it down onto the inclined surface of the cap, and forces it out through the opening made by the edge of the hopper and the surface of the cap to between the stones, where it is ground and carried by centrifugal force to the circumference of the stones, and drops onto the holder 0. The sweeps o o, fixed to the runner-stone, sweep it through the spout to into any receptacle.

In case the stones should grind too fine or too coarse, they may be removed fartherfrom or brought closer to each other by the leverK and the-lighter rod L 5 or in case the opening between the edge of the hopper and the cap does not permit the necessary feed, it can be remedied by raising or lowering the hopper by means of the screw H and the forked lever G.

By my ball-balance or method of balancing the runner-stone I gain the great advantage of being able to make a connection on the spindle with a feed screw or rigging, so thatthe upper stone can remain stationary and that the working of the screw can in no way interfere with the balancing of the runner-stone. ,Bythe old method of balancing the stone on a point to make aconuection with a feed rigging or screw, a projection 0r spindle had to be made on the top of the rynd or the runner-stone, so that a regular and even feed or pressure on all parts of the feed-screw was absolutely necessary to the perfect balancing of the runner-stone.

hat I claim as my invention, and desire to secure by Letters Patent, is-

1. Rounding the shoulder r of the part q 7 in presence of two subscribing witnesses.

GEORGE PHILIP ZINDGRAF. Witnesses:

FRANCIS D. PASTORIUS, J OHN ANDERSON. 

